Marco Arment has a great post on why he stopped offering the free
“lite” version of Instapaper and may never bring it back.

Only people who buy the paid app — and therefore have no problem paying $5
for an app — can post reviews for it. That filters out a lot of the sorts of
customers who will leave unreasonable, incomprehensible, or inflammatory
reviews. (It also filters out many people likely to need a lot of support.)